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  • Polymer and Materials Science  (76)
  • Life and Medical Sciences  (22)
  • GENERAL
  • 1
    Digitale Medien
    Digitale Medien
    PPP calculations of the circular dichroism spectra of some dinucleoside phosphates (1972)
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 1091-1102 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Circular dichriosm (CD) spectra have been calculated for serveral dinucleoside phosphates using a variant of the Pariser-Parr-Pople π-electron molecular orbital method. This method does not require the prior knowledge of the experimental absorption spectra of transition moments of the bases forming the dinucleoside phosphates. Calculated spectra were obtained in good agreement with experimental spectra for four dinucleoside phosphates, ApA, UpU, GpA, and UpA, and reasonable agreement was obtained for ApG and ApU. The effect of changing conformation on the CD spectrum was studied for ApA, UpU, UpA, and ApU; the spectra of UpU, UpA, and ApU were sensitive to small change in conformation, whereas ApA was insensitive over the range of conformation studied. Further studies await detailed knowledge of the structure of dinucleoside phosphates in solution.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1972.360110511
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  • 2
    Digitale Medien
    Digitale Medien
    The synthesis of monomers that expand on polymerization. Synthesis and polymerization of 8,10,19,20-tetraoxatrispiro[5.2.2.5.2.2]heneicosane (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 3231-3235 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Das Spiroorthocarbonat, 8,10,19,20-Tetraoxatrispiro[5.2.2.5.2.2]heneicosan (1), welches zwei Cyclohexylgruppen enthält, wurde dargestellt. Das Monomere wurde mittels eines kationischen Katalysators wie Bortrifluoridätherat oder Zinn(IV)-chlorid polymerisiert. Die Struktur des Polymeren wurde mit Hilfe der IR und NMR Spektren bestimmt; es sind Copolymere mit alternierenden Äther- und Carbonatverknüpfungen. Das Monomere 1 expandiert bei der Polymerisation.
    Notizen: A spiro orthocarbonate containing two cyclohexyl groups, 8,10,19,20-tetraoxatrispiro[5.2.2.5.2.2]heneicosane (1), was prepared. The monomer was polymerized with Lewis acids such as boron trifluoride etherate or stannic chloride as catalysts. The IR and NMR spectra indicated that the polymer was an alternating copolymer with ether and carbonate linkages. This monomer underwent expansion on polymerization.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1976.021771111
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  • 3
    Digitale Medien
    Digitale Medien
    Free radical ring-opening polymerization (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 13 (1985), S. 171-190 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Since unstrained five- or six-membered carbocyclic systems normally undergo free radical ring-closing polymerizations, only highly strained cyclic monomers had been shown to undergo free radical ring-opening polymerization. However, since a carbon-oxygen double bond is some 50 kcal more stable than a carbon-carbon double bond, it has been found that a variety of four- to sevenmembered heterocyclic monomers will undergo extensive free radical ring opening polymerization. Among the monomers, that have been shown to undergo such ring opening on polymerization, can be included cyclic ketene acetals, cyclic ketene aminals, cyclic vinyl ethers, unsaturated spiro ortho carbonates, and unsaturated spiro ortho esters. These monomers will also undergo copolymerization with a wide variety of vinyl monomers with the introduction into the backbone of the resulting addition polymer of an ester, amide, keto or carbonate group. Such introduction will make possible the synthesis of functionally terminated oligomers, biodegradable addition polymers, polymers with enhanced thermal stability, and monomers that expand on free radical polymerization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1985.020131985113
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  • 4
    Digitale Medien
    Digitale Medien
    Investigation of the polymerization mechanism of 4′-methylenespiro[2-benzofuran-2,2′-(1,3-dioxolane)] (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 1651-1658 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The propagation reaction of 4′-methylenespiro[2-benzofuran-2,2′-(1,3-dioxolane)] (2), initiated by a free radical initiator, was studied by analysis of the polymer structure and by kinetic investigation. The results indicate that the polymer has the structure of poly [methylene-spiro[2-benzofuran-2,2′-(1,3-dioxolane)]-4′-ylidene-co-(2-oxotrimethylene)] (10). A reasonable propagation mechanism is proposed.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1987.021880712
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  • 5
    Digitale Medien
    Digitale Medien
    Synthesis of monomers expanding on polymerization. Synthesis and polymerization of 3-methylene-1,5,7,11-tetraoxaspiro[5.5]undecane (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2897-2903 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Ein Spiro-orthocarbonat, das eine Doppelbindung enthält [3-Methylen-1,5,7,11-tetraoxaspiro[5.5]undecan (2)], wurde aus 2-Methylen-1,3-propandiol dargestellt. Die Struktur von 2 wurde elementaranalytisch sowie IR und NMR-spektroskopisch bestätigt. Das Monomer 2 wurde mittels eines kationischen Katalysators, Bortrifluoridätherat oder Zinntetrachlorid, polymerisiert. Aus den IR und NMR Spektren des Polymers geht hervor, daß es sich um ein alternierendes Copolymer mit Äther- und Carbonat-Bindungen handelt, das außerdem eine doppelt gebundene Seitengruppe enthält (Struktur 8). Das Monomer 2 erfährt eine Ausdehnung während der Polymerisation.
    Notizen: A spiro ortho carbonate containing a double bond, 3-methylene-1,5,7,11-tetraoxaspiro-[5.5]undecane (2) was prepared from 2-methylene-1,3-propanediol. The structure of the monomer was confirmed by its elemental analysis, IR and NMR spectra. The monomer was polymerized with Lewis acids such as boron trifluoride etherate and stannic chloride (tin tetrachloride) as catalysts. The IR and NMR spectra indicated that the polymer has the structure of an alternating copolymer containing ether and carbonate linkages with a pendant double bond (structure 8).Monomer 2 underwent expansion on polymerization.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1975.021761011
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  • 6
    Digitale Medien
    Digitale Medien
    Synthesis and free radical ring-opening polymerization of 2-methylene-4-phenyl-1,3-dioxolaneThis research was supported in part by Grant No. DMR-77-28322 from the Polymer Program of the National Science Foundation. (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1913-1920 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The cyclic ketene acetal, 2-methylene-4-phenyl-1,3-dioxolane (3), was shown to undergo free radical ring-opening polymerization to produce the polyester, poly[γ-(β-phenyl)butyrolactone]. The monomer 3 was synthesized by an acetal exchange reaction of chloroacetaldehyde dimethyl acetal with styrene glycol in an 87% yield followed by dehydrochlorination of the resulting cis and trans-2-chloromethyl-4-phenyl-1,3-dioxolane (2) with potassium tert-butoxide in tert-butyl alcohol in a 70% yield. 3 was shown to undergo essentially quantitative free radical ring-opening at all temperatures from 60-150°C and also nearly complete regioselective ring-opening with cleavage to give the more highly stable secondary benzyl free radical. Even in free radical copolymerization with styrene, methyl methacrylate, vinyl acetate, or 4-vinylpyridine, 3 gives essentially complete ring opening to introduce an ester groups into the backbone of the addition copolymer. The structures of the polymers were established by elemental analysis and 1H and 13C NMR spectroscopy.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1982.021830811
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  • 7
    Digitale Medien
    Digitale Medien
    Aspects of the ultrastructure of the alimentary canal and respiratory ducts in Xenopus laevis larvae (1972)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 138 (1972), S. 387-405 
    Details
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The pharynx, intestine and respiratory duct of Xenopus laevis were examined by light and electron microscopy, at different stages of the metamorphic cycle, through climax.It is well known that preclimactic larvae are suspension feeders and that after climax specimens feed on solid food. It is shown that the histology of the pharynx and the alimentary canal changes in adaptation to the change in the mode of feeding.Suspension feeding utilises ciliary activity but after climax cilia have disappeared from the pharynx and alimentary canal, when new neuromuscular mechanisms are utilised in feeding.Other morpho-histological changes in various intestinal and respiratory tissues are likewise considered in terms of functional activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jmor.1051380402
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  • 8
    Digitale Medien
    Digitale Medien
    The osteology and relationships of the phallostethid fishes (1936)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 59 (1936), S. 453-483 
    Details
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Two genera of the Phallostethid fishes were anatomized using both the clearing and the dissection methods. While resembling Poecillids and agreeing with them in numerous anatomical features, these fish are true Acanthopterygians and apparently are correctly placed by Myers in the suborder Phallostethoidea erected for them in the order Percesoces. The two divergent types of priapia found in the group are readily derivable one from the other, corresponding bone for bone. The priapial bones can be homologized with the missing pelvic fins and girdle plus, perhaps, the post cleithrum and some of the pectoral pterygials. A comparison is made between the Phallostethid priapial skeleton and the highly modified girdle complex of the Polynemids.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jmor.1050590304
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  • 9
    Digitale Medien
    Digitale Medien
    Morphology of poly(vinylidene chloride) and of the carbons resulting from its pyrolysis (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 87-104 
    Details
    ISSN: 0449-2978
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: This paper reports an electron microscopy study of the morphology of crystals of poly(vinylidene chloride) prepared under a variety of conditions and of the carbons resulting from the pyrolysis of the polymer. The structure of the polymer carbons prepared under conditions such that the polymer does not pass through a plastic phase is closely related to the morphology of the original polymer. The shapes of the crystals and of the crystal pseudomorphs are indexed in terms of the unit cell proposed by Narita and Okuda. Morphological studies of this kind are important in discussing the graphitizability of polymer carbons, their mechanical properties and pore structure, and the kinetics of the dehydrochlorination reaction.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1969.160070107
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  • 10
    Digitale Medien
    Digitale Medien
    The subocular shelf of fishesThis study has been made possible by a research grant from the National Science Foundation (G-6368). (1962)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 110 (1962), S. 1-17 
    Details
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jmor.1051100102
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